Surgical souvenir (4)
I believe the answer is:
scar
'surgical souvenir' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scar that I've seen before include "Remains of a wound" , "Sign of wound" , "Permanently damage" , "Skin mark; bare crag" , "Mark, blemish" .)